feat(runner): add TOML config file support for matrix benchmarks

- Add toml and serde dependencies
- Create config module with Config and BenchmarkConfig structs
- Add --config CLI option for matrix benchmarks
- Refactor `run_benchmark()` to accept BenchmarkConfig

runner/Cargo.toml

@@ -14,6 +14,8 @@ tokio.workspace = true
 tracing.workspace = true
 tracing-subscriber.workspace = true
 uuid.workspace = true
+serde.workspace = true
+toml.workspace = true
 
 [lints]
 workspace = true